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Total

DNS

Email

Security

Network

100

Availability

Domaindfn.de

IPv41

IPv61

MX records3

StatusActive

Domain technical report

Startseite - DFN

dfn.de

Generated: 2026-08-11T06:27:57-05:00 · Cached result

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IPv41

IPv61

MX3

NS4

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

✓

IPv6 (AAAA)10 / 10 pts · Dns

1 IPv6 address(es) detected.

✓

Name server redundancy20 / 20 pts · Dns

4 NS record(s); 2 or more required.

✓

SOA record10 / 10 pts · Dns

Authoritative zone record.

✓

DNSSEC chain15 / 15 pts · Dns

DS and DNSKEY detected.

CAA policy0 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

3 MX record(s).

✓

SPF25 / 25 pts · Mail

SPF policy published.

✓

DMARC25 / 25 pts · Mail

DMARC policy published.

✓

DKIM20 / 20 pts · Mail

A DKIM selector was verified.

MTA-STS0 / 5 pts · Mail

Mail transport policy.

TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

28 day(s) remaining.

Certificate lifetime6 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers4 / 35 pts · Security

1 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: www.dfn.de

IPv4 diversity20 / 35 pts · Network

Two or more IPv4 addresses receive full points.

✓

IPv6 connectivity35 / 35 pts · Network

AAAA availability.

✓

DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

✓

HTTP response40 / 40 pts · Availability

HTTP/2 200

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)

37.208.106.105

AAAA

1 record(s)

2a00:d0c0:c:2109::11

CNAME

0 record(s)

—

Not configured

MX

3 record(s)

10 b1001.mx.srv.dfn.de.
10 c1001.mx.srv.dfn.de.
10 a1001.mx.srv.dfn.de.

TXT

4 record(s)

"google-site-verification=aNjf9WiXv4G4mjXnYovwIjOS01qfUjBGQbV5xomVJ44"
"apple-domain-verification=TdQByV6omDQj06SD"
"google-site-verification=AHsv25T5W2sYiYNmYvU6z8a2G1H_7FM0vJOZf5uOhAE"
"v=spf1 include:_spf.s1004.mx.srv.dfn.de a:deneb.dfn.de include:_spf.dfn-cert.de include:_spft.telekom.com ~all"

NS

4 record(s)

ns1.dfn.de.
ns4.dfn.de.
ns3.dfn.de.
ns2.dfn.de.

SOA

1 record(s)

ns1.dfn.de. hostmaster.dfn.de. 1786443368 28800 7200 3024000 3600

CAA

0 record(s)

—

Not configured

DS

1 record(s)

52345 13 2 CB45E805D6DE033CD632640B0E75E01DA9D9DE19FF70B6FCBB233DAB 802D5F16

DNSKEY

2 record(s)

257 3 13 m3JcLlX53CVTANTFIhPcqt5TQoggiO0jecgtrvZrNCUb0Ua7jVCp5D+m c/O2WC+DATwwHjtEAruUS+qxmdy8LA==
256 3 13 2qMruUzdhGnYT4JaXoJQ5iIKt4hQ7xj4GDUNblUtOlcVJSYlSzPsKruJ ddmM7AgPRh5g7NwUeN3D7Gb/4q4c9g==

RRSIG

6 record(s)

DNSKEY 13 2 60 20260830040854 20260731035437 52345 dfn.de. f/jPPRB4QTI6h1ntFlSIgP8FmbT5VSynkiLVhPyiCcz/5rIpkqpmZpvt pqIHWfAgLO3jKB9ZlFYY7abARwm4Dg==
AAAA 13 2 86400 20260908114137 20260809105515 15867 dfn.de. ykduL7UVyQPXvFJ8TSZ5INnRdGPzdBv1V5bO2UEsFq9KrIVTh3Q9gZFY yaa1XNv/k0KlGeVRu3g+5EvdjSznLg==
MX 13 2 86400 20260901090450 20260802082932 15867 dfn.de. Ue+d6bYmiCRWQJ+Ag7pKzxUz2OSCwBcGGLZXQuioUGJ25zg7oQCqOn8n UC01I8VOiBeR/hkCeYO5hFU2+5a0JA==
A 13 2 86400 20260908114137 20260809105515 15867 dfn.de. f9GpolnCDHjRNxNVxgknl3kTLlyTDmVG1ME4A6rGKHIgUGL1glzGkgEy JnXa9W8ZfEfijBvdIMzpoKOae2szMw==
DS 8 2 86400 20260817120903 20260803103903 32911 de. omfr3rKdEN/rCNZ+lq3FhrpIRjv7u9mhCZ5RyuLhplKyMN1ug5eKesom iob3n3gbBBVUyF1ohwoVgyPMSvFrPZJpXTEgwflWUAby2nBpzWntzjB1 K0mmo6iWrvkvOIoaJBUtTgeZHRULkwJNiQ54Pqca+XOUoXtbDVT6whfa cN4=
NS 13 2 86400 20260907150145 20260808141824 15867 dfn.de. 9+UhbHpQjWx4hGsUUyHa0di1BibCZEvemJuAsnFseL/TeyRRIWvXeBlG FjXN6DCzMfVaqGaKvryFLk35diCHog==

NSEC

1 record(s)

_dmarc.dfn.de. A NS SOA MX TXT AAAA NAPTR RRSIG NSEC DNSKEY TYPE65534

NSEC3

0 record(s)

—

Not configured

SRV

0 record(s)

—

Not configured

NAPTR

1 record(s)

100 10 "s" "x-eduroam:radius.tls" "" _radsec._tcp.eduroam.de.

TLSA

0 record(s)

—

Not configured

SSHFP

0 record(s)

—

Not configured

SPF

Configured

v=spf1 include:_spf.s1004.mx.srv.dfn.de a:deneb.dfn.de include:_spf.dfn-cert.de include:_spft.telekom.com ~all

DMARC

Configured

v=DMARC1; p=none

DKIM

Selector s1

v=DKIM1; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC5tjEwjdy5Xynwaub38d3Lk1e87O2W0qNp69swt85//ZjXNckUDm1dMK8/Aj8DIyASgDDOHjUrBzSx7a/EchjqgN0S+JFs+DPy+FQsGuNZReVaaBgB3OjqJ25R1CZwDoKK2cD3f4RNhYLctuboB14AZSLtMx6hJ0w0XhJKZ3kyrwIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Startseite - DFN

Description

Final URL

https://www.dfn.de/

HTTP status

206

HTTP

Status

HTTP/2 200

Final URL

https://www.dfn.de/

Version

Server

Apache

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Hellenic Academic and Research Institutions CA

dfn.de

Valid from

2025-09-09T02:24:20-05:00

Valid until

2026-09-09T02:24:20-05:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

Security headers

1 active

✓

HSTSImplemented

—

Content Security PolicyNot detected

—

X-Content-Type-OptionsNot detected

—

X-Frame-OptionsNot detected

—

Referrer PolicyNot detected

—

Permissions PolicyNot detected

—

Cross-Origin-Opener-PolicyNot detected

—

Cross-Origin-Embedder-PolicyNot detected

—

Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

37.208.106.105

386,77 ms

Cloudflare

1.1.1.1

37.208.106.105

272,17 ms

Quad9

9.9.9.9

37.208.106.105

50,23 ms

OpenDNS

208.67.222.222

37.208.106.105

647,40 ms

AdGuard

94.140.14.14

37.208.106.105

237,93 ms

IP, geolocation and ASNAssociated network information

37.208.106.105

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

b1001.mx.srv.dfn.de

Port 25: Closed/unreachable - 130.1 ms - 
Port 465: Closed/unreachable - 4020.7 ms - 
Port 587: Closed/unreachable - 4009.9 ms -

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